Mumbai: Indigenously-built stealth warship, INS Satpura, the second of the three-ship Project-17 Shivalik Class frigates built by the Mumbai-based Mazagon Docks (MDL) was commissioned by the Chief of Naval Staff Admiral Nirmal Verma. Conceived and designed by the Indian Naval design team, Satpura will be among the mainstay frigates of the force for the next few decades.

The next warship of the class INS Sahyadri is also expected to be inducted into the Navy in next six to eight months. Along with the three stealth frigates under Project-17, three Kolkata class destroyers under Project 15 A and six Scorpene class submarines are under construction at MDL.

According to reports the total cost of the three Shivalik-class frigates (Project 17A) will be Rs 7,883 crore. Imported components, like the on-board weapons, sensors and radars, engines, transmission etc, account for approximately Rs 2,710 crore - approximately 40 percent.

An agreement with Essar Steel for manufacturing warship-grade steel helped in lowering the cost of imported equipment. Crucial dimensions of design and integration have also been indigenised. Indigenisation levels are expected to rise dramatically in the next two lines of warships that are coming on stream next year, i.e. in Project 15B (four destroyers) and Project 1A (seven frigates).

The ship is powered by 2 US-origin General Electric LM-2500 gas turbine engine and 2 French SEMT Pielstick diesel engine, one on each shaft driving a large diameter controllable pitch propeller.

The LM 2500 Gas Turbine engines enable the ship to generate speeds in excess of 30 knots (or over 55 kmph) and the SEMT Pielstic Diesel Engines are for normal cruising speeds. This is known as CODOG (combined diesel or gas) configuration.

The 142.5-metre-long warship, with 6,200-tonne displacement, has versatile control systems with signature management and radar cross-section reduction features. It has been provided with structural, thermal and acoustic stealth features to augment its potent capability. The Satpura is equipped with a mix of imported and indigenous weapon systems and sensors, including Barak surface-to-air missiles, 'SHTIL' air defence system, rapid fire guns and basic anti-submarine warfare weapons.

The ship’s electric power is provided by four Diesel Alternators, which together produce 4 Mega-Watts of power-enough to light up a small town.The power generation and distribution on board is controlled through an ‘Automated Power Management System’ (APMS).

A stealth warship is designed to have low signatures so that they remain undetected to enemy sensors. Its shape is designed to evade detection by radar; it is engineered to give off minimal infra-red (IR) emissions; and every piece of equipment on board, is designed to work silently to escape the enemy’s sonar and acoustic sensors.

From a small dry dock built to service ships of the British East India Company, Mazagon Dock Limited is today the Country’s premier warship building yard. By next year, MDL would have delivered all three in the series. The Shivalik Class frigates are part of the Project 17 of the Indian Navy under which multi-role frigates with stealth features are being built for the Indian Navy at Mazagon Dock Limited. The first ship of the Class INS Shivalik was commissioned on April 29 last year and launched India into the league of countries with the capability of building stealth frigates.